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Complete Compiled Specification.pdf - Peck Ormsby Construction

Complete Compiled Specification.pdf - Peck Ormsby Construction

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SECTION 15800 - AIR DISTRIBUTION<br />

PART 1 - GENERAL<br />

SCOPE:<br />

Work shall include the air distribution, ventilation, and exhaust duct systems, and all materials, equipment,<br />

and labor required to complete the systems shown on plans and specified herein.<br />

PART 2 - PRODUCTS<br />

Construct all ducts, plenums, etc., of the gauges specified in the latest editions of the applicable SMACNA<br />

manuals, unless otherwise shown. Sheets shall be free from blisters, slivers, pits, and imperfectly<br />

galvanized spots.<br />

Duct construction and installation details shall comply with the latest edition of the SMACNA Duct<br />

<strong>Construction</strong> Standards.<br />

Ducts from the fan unit discharge to VAV terminal boxes shall be constructed to meet the requirements of a<br />

+4 inch pressure class. All other supply air ducts shall be designed to meet the requirements for +2 inch<br />

pressurized ducts. All exhaust ducts shall be -2 inch suction ducts.<br />

+4" PRESSURE CLASS DUCTWORK:<br />

All ductwork on the discharge side of Air Conditioning units to the terminal boxes shall be +4" pressure class<br />

duct. It is the essence of the duct system to have a minimum pressure loss. Therefore, ducts shall be run in<br />

a straight line and shall be run so that the lowest beam or obstruction shall generally determine the<br />

centerline of the straight run. Eccentric reducing transition shall be avoided, but may be used where space<br />

is a determining factor. Bends and elbows other than those shown on the drawings shall have the approval<br />

of the Owner's representative before installation. No pipes, conduits, or any other obstructions shall be run<br />

through +4" P.C. ductwork.<br />

ROUND DUCTWORK +4" PRESSURE CLASS:<br />

The round +4" P.C. HVAC ductwork, fittings, and accessories shall be factory fabricated, spiral conduit.<br />

Ductwork may, when approved by the owner's representative, be fabricated in a 26 ga. standing rib<br />

configuration. The ducts shall be constructed of rust-resistant zinc-coated steel and shall be of the sizes<br />

called for on the drawings.<br />

All fittings in the round ducts shall be factory fabricated to match the spiral ducts and shall be of the same<br />

manufacturer.<br />

Round duct joints in diameters through 50 inches shall be sealed as follows:<br />

-<br />

___________________________________________________________________________________<br />

____________<br />

SEGO LILY ELEMENTARY SCHOOL CLASSROOM ADDITION March 2, 2009<br />

AIR DISTRIBUTION 15800 - 1

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